The webbing looks to be fine... do you already have it ??
Because of the riveted leather O-piece it is a little suspicious.... the Y straps could be made from original backpack straps
I would like to compare the stitching of the pieces round the O-ring, with the other stitching.....
If this is exactly the same it has a good chance of being an original (with added rivets(??))
The endstrap looks to be original as well.... although the stitching of the hook is made with lighter thread ... but that is not uncommon, since it is a loose piece
So no definite answer... sorry
JP? what are your thoughts about this one